<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .element {
        color: aliceblue;
        background-color: var(--undefine-color, #888);
        width: 200px;
        height: 200px;
        display: flex;
        justify-content: space-around;
        align-items: center;
      }
    </style>
  </head>

  <body>
    <div class="element">123</div>
  </body>
</html>
